Gun for directing plastic material against work



May 29, 1956 M. M. TRUE GUN FOR DIRECTING PLASTIC MATERIAL AGAINST WORK2 Sheets-Sheet 1 Original Filed March 17, 1953 INVENTOR.

MAX M. TRUE ATTORNEY 284 286 29a 7a 4 32:; 320m} 322 340 z 24 53a :1 VI3'-* United States Patent- 1 2,747,846 GUN FOR DIRECTING PLASTICMATERIAL AGAINST WORK Max M. True, Tulsa, Okla.

Original application March 17, 1953, Serial No. 342,952. Divided andthis application October 18, 1954, Serial No. 462,947

4 Claims. (Cl. 259-151) This invention relates to a gun for directingplasticized material against work and aerating and frothing saidmaterial to lighten it and facilitate its deposit on the work.

One object is to aerate and froth the material adjacent its point ofdischarge to assure homogenity and aeration of the material immediatelybefore its discharge.

A still further object is to assure suspension of the material in theatmosphere between the time that it leaves the gun and the time of itsdeposit on work.

The above and other objects may be attained by employing this inventionwhich embodies among its features an elongated body having alignedrecesses entering opposite ends and defining an aggregate inlet and anaggregate discharge passage, said body having spaced converging passagestherein and establishing communication between the aligned recesses,means for regulating the flow of aggregate through the gun comprising athimble mounted in the aggregate inlet for rotation about thelongitudinal axis thereof, said thimble having ports extendingtherethrough adjacent the inner end of the inlet recess for registrationwith the divergent ends of the converging passages, and means carried bythe thimble and extending radially outwardly therefrom and through thewall of the inlet recess for rotating the thimble and moving the portsinto and out of registration with the passages.

Other features include a hollow conical extension carried by the thimbleand projecting longitudinally therefrom, an end wall closing the end ofthe conical extension remote from the thimble, said conical extensionhaving diametrically opposed ports extending therethrough forregistration with the passages when the thimble is rotated to a selectedposition about its longitudinal axis, and means carried by the thimbleand extending through the body for rotating the thimble and moving theports into and out of registration with the passages when the thimble isrotated to a selected position about its longitudinal axis, andmeanscarried by the thimble and extending through the body for rotating thethimble and moving the ports into and out of registration with thepassages.

Still other features include a semi-spherical end on the conicalextension adapted to fit into a semi-spherical socket carried by thebody between the divergent ends of the passages.

This application is a division of my co-pending application Serial No.342,952 filed March 17, 1953.

In the drawings:

Figure l is a side view in elevation of a gun used for distributing theplasticized material.

Figure 2 is a vertical sectional view taken substantially on line 11-11of Figure 1.

Figure 3 is a horizontal sectional view taken substantially on the line12-12 of Figure 1.

Figure 4 is a vertical sectional view taken substantially on line 13-13of Figure 3.

Figure is a horizontal sectional view taken substantially on line 14-14of Figure 1.

Figure 6 is a vertical sectional view taken substantially on line 15-15of Figure 5, and

Figure 7 is a sectional view taken substantially on line 16-16 of Figure6.

shown) of air pressure.

A gun is designated generally 270 comprising an elongated body 272having aligned openings 274 and 276 entering opposite ends and formingrespectively inlet and discharge passages for the plasticized materialbeing distributed. Establishing communication between the alignedopenings 274 and 276 are convergent passages 278 which converge as theyapproach the discharge passage 276 and are separated adjacent the inletpassage 274 by a post 280 having a concave spherical recess 282 thereinwhich faces and aligns axially with opening 274. As shown in Figure 3the divergent ends of the passages 278 curve inwardly about the post 280and merge with the opening and fitted in the body 272 adjacent oppositeends of the opening 274 are anti-friction bearings 284 in which ismounted for rotation a valve thimble designated generally 286.

The valve thimble 286 above referred to comprises a tubular body 288carrying at one end a hollow conical extension 290 which terminates atits smaller end in a head 292 having a convex spherical surface 294which seats in the concave recess 282 and cooperates therewith.

the side of the body 272 and communicating with the opening passage 274is a slot 298 through which projects a control handle 300 which iscarried by the thimble 286 and by which the thimble is rotated to movethe ports 296 into and out of registration with the passages 278.

Entering the post 280 opposite the recess 282 is a bore 302 which isinternally screw threaded to threadedly receive an air tube 304 whichextends axially from said bore 302 through the opening 276 in concentricspaced relation therewith. A rod 306 is carried by the post 280 andextends axially through the air tube 304 and beyond the end of the body272 adjacent the opening 276. The rod 306 is threaded as at 308 adjacentthe end thereof remote from the post for threaded engagement with asubstantially conical spreader 310 by which is controlled the pattern ofa stream of aggregate issuing from the gun.

Bearing against a shoulder 312 formed in the body 272 at the junction ofthe opening 276 and passages 278 is an aggregate condensing ring 314having a conical passage 316 extending therethrough in concentric spacedrelation to the air tube 304. Seated in the opening 276 against thecondensing ring 314 is an aggregate discharge nozzle designatedgenerally 318 and comprising a tubular body 320 carrying adjacentopposite ends outwardly extending annular flanges 322 which supportthebody 320 in spaced relation to the wall of the opening 276 to definetherewith around the body 320 an annular air chamber 324. An externallyscrew threaded retaining ring 326 threadedly engages the wall of theopening 276 adjacent the end thereof remote from the condensing ring 314and bears on the nozzle 318 to hold it in place. Extending through thebody 320 at spaced intervals are inclined air discharge passages 328having therein inner discharge ends directed toward the discharge end ofthe gun while their outer ends communicate with the chamber 324.

Opening through the bottom of the body 272 and 8151-." tending thereintobelow the passages 278 is a recess 330 into which is threaded an airpressure supply fitting which is connected in any suitable manner with asource (not: Extending transversely in the Patented May 29, 1956Extending through body 272 and communicating with the recess 330 is anair passage 332 which opens into an upwardly extending passage 334 whichopens into a bore 336 adjacent one end thereof. The bore 336 extendstransversely through the body 272 above the passages 278 andcommunicates adjacent opposite ends with air discharge passages 338which extend downwardly within the body 278 adjacent opposite sidesthereof and terminate in ports 340 which open axially into the passages278 so that air jets issuing through said ports will penetrate the coreof the aggregate passing through the passages to aerate and homogenizethe aggregate.

Extending longitudinally within the body 272 above the passages 278 isan air duct 342 which opens at one end into the bore 336 midway betweenopposite ends thereof and perpendicular to the passages 338. A duct 344is formed in the body 272 adjacent the base 336 and communicates at oneend with the bore 302 in port 280 adjacent its opposite end with theduct 342. A parallel duct 346 establishes communication between the duct342 and the chamber 324 so that when air is supplied to the duct 342 itwill be projected through the air tube 304 and the air dischargepassages 328.

The end of the bore 336 adjacent the air passage 334 is closed by athimble 348 which forms an annular abutment 350 against which bears oneend of an elongated turning plug 352 carrying at one end a stern 354.This turning plug fits snugly within the bore 336 and surrounding thestem 354 and threadedly engaging the bore 336 adjacent the end thereofremote from the thimble 348 is a conventional packing gland 356. Ahandle 358 is carried by the stem 354 by which the plug 352 may beturned to various positions within the bore 336. Opening through the endof the turning plug 352 remote from the stem 354 is a bore 366 andextending through the turning plug 352 substantially midway betweenopposite ends of the bore are aligned ports 362 and 364 which areadapted to register with the passage or duct 342. Extending through theturning plug 352 adjacent opposite'ends of the bore 366) are ports 366which in one position of the plug 352 register with the passage 338. Theaxes of the ports 366 lie in a common plane which intersects the axis ofthe turning plug 352 in perpendicular relation to the axes of the ports362 and 364. It will thus be seen that when the port 364 registers withthe duct 342 the ports 366 will register with the passages 338 and theair will be distributed throughout the entire system. However when theport 364 registers with duct 342 no air will enter the passages 338though full air pressure will be delivered to that portion of the gun infront of the passages 238.

With the gun 270 connected by a suitable flexible conduit' 370 to asuitable source of plasticized aggregate which is forced under pressurethrough the conduit to the gun, the mixed aggregate will enter the gunthrough the thimble 286, and with the air tubes 276 connected to acourse of air under pressure, air will enter the chamber 339 and fillthe passages 332, 334 and 360 with air under pressure. Upon manipulatingthe handle 300, the thimble 288 may be rotated about its axis in therecess 274' to bring the ports'296 into registration with the passages2'78'so that the aggregate will be forced therethrough and into thedischarge barrel 318 from which it is discharged toward the work. Uponrotating the turning plug 352, the ports366 may be brought into registerwith the passages 338 to direct air jets into the cores of the streamsof aggregate passing through the passages 278 to homogenize and aeratethe aggregate. Simultaneously with the bringing of the ports 366 intoregister with the passages 338 the port 362 in the turning plug 352 willregister with the duct 342 so that air will pass through the passage334'and air tube 304 to project the aggregate onto the work. By 'reason'of the entrance of the air into the duct 342 air will enter the chamber324 through the passage 346 and will project through the inclinedpassages 328 in the nozzle 318 to impinge in the aerated and homogenizedmaterial and propel it through said nozzle. The pattern of the stream ofaggregate propelled through the nozzle and projected by the air issuingfrom the air tube 304 is regulated by turning the conical spreader 310and adjusting its position lengthwise on the rod 308. When the coatingoperation has been completed, the gun 270 and tube 370 may be cleared ofplasticized material by discontinuing the fiow of air into the mixingtank from which delivery has been made and rotating the turning plug tobring the port 364 into register with the duct passage 342 and closingthe discharge end of the gun to build a back pressure in the passages278 and the thimble 288.

What is claimed is:

l. A gun for directing against work an adhesive plasticized aggregate,said gun comprising an elongated body having aligned recesses enteringopposite ends and defining aggregate inlet and aggregate dischargepassages, said body having spaced converging passages extending thereinand establishing communication between the aligned recesses, an air tubecarried by the body and projecting axially through the aggregatedischarge passage, said body having an air chamber therein for receivingair under pressure, said body also having an air duct therein whichcommunicates with the chamber and the air tube, and valve means in saidbody and interposed in the air duct between the chamber and the tube forregulating the flow of air through the air tube.

2. A gun for directing against work an adhesive plasticized aggregate,said gun comprising an elongated body having aligned recess enteringopposite ends and defining aggregate discharge passages, said bodyhaving spaced converging passages extending therein and establishingcommunication between the aligned recesses, an elongated tubular bodyhaving outwardly extending annular flanges fitted in the recessesdefining the aggregate discharge passage and cooperating with the wallsof the recess in defining an annular air chamber, and tubular bodyhaving angularly disposed air discharge passages extending therethroughfor directing air jets against aggregate entering said tubular body andpropelling said aggregate through said body, and ducts within the gunbody and communicating with the chamber for delivering air underpressure to the chamber.

3. In a gun for directing an adhesive plasticized material against work,an elongated body having aligned recesses opening through opposite endsand spaced passages establishing communication between said recesses,means for'aerating and homogenizing plasticized material entering thegun and propelling it through the passages, said means comprising an airtube carried by the body and extending axially through one of therecesses, said body having ports opening into the passages in axialalignment therewith, said body having an air chamber therein and a boreextending transversely therethrough above the passages, said body havingair ducts therein which establish communication between the air chamberand the bore and other air ducts therein which establish communicationbetween the bore and the ports, a turning plug mounted in the bore forrotation therein, and said turning plughaving ports extendingtherethrough which establish communication between the bore and theother air ducts.

4. The structure defined in claim 3 in which the body has still otherair ducts which establish communication between the bore and the airtube, and the turning plug has diametrically opposed parts extendingtherethrough for establishing communication between the bore and thestill'other ducts.

References Cited in the file of this patent UNITED STATES PATENTS2,666,626 True Jan. 19, 1954

